Add .dist extension to PHPUnit configuration file in plugin-tests.
Add .dist extension to PHPUnit configuration file in plugin-tests.

Naming the file `phpunit.xml.dist` instead of `phpunit.xml` is considered a best practice because it allows other developers working on a project to override the configuration without messing with extra command line parameters or dirtying their local version control state.

See http://www.testically.org/2010/08/24/best-practice-how-to-ship-phpunit-configuration/

wp-cli/wp-cli,wp-cli/wp-cli